Image reading apparatus capable of reading an image with improved accuracy

An image reading apparatus, comprising:

• a body including,
• an exposure glass,
• a reader configured to read an image of an original sheet through the exposure glass, and
• means for guiding disposed on the exposure glass and for supporting the original sheet, and including a first and second means for positioning disposed in upstream and downstream ends of a sheet conveyance direction;
• and
• an auto document feeder configured to be swingably moved between an open position and a closed position relative to the body and to feed the original sheet onto the exposure glass when situated at the closed position, the auto document feeder including,
• means for pressing the original sheet onto the exposure glass, and
• means for contacting the means for guiding, including first and second slanted portions respectively disposed in upstream and downstream ends of a sheet conveyance direction, to contact the first and second means for positioning at both of the first and second slanted portions in the upstream and downstream ends of the sheet conveyance direction when the auto document feeder is situated at the closed position so as to form a slit between the exposure glass and the means for pressing, the slit allowing the original sheet to pass therethrough, the means for contacting being mounted to the means for pressing.